Sand screen



July 5, 1932. P. D. B. PAVONE SAND SCREEN Eiled Kay 24'. 1926 m m q Patented Jul 5, 1932 UNITED: STATES 2mm 1). n rAvo'NEfon BRInGEr'oR'n'coNNEoTIou'r saunson'nnn' Application filed May 24,1926. serial No. 111,217. r

This invention relates to a' machine for screening sand or the like, and has for an obj ect to provide an improved construction and arrangement of the screening device which will be simple in construction, which will i have a greater capacity for the size of screens used, and will be very efficient and effective in operation.

It is also an object of the invention to provide a screen of a relatively large capacity which will occupy comparatively small space. With the foregoing and otherv objects in view, I have devised the construction illustrated in the accompanying drawing forming a part of this specification, similar reference characters being employed throughout the various figures to indicate corresponding elements. In this drawing,

Fig. 1 is a side elevation of the device. Fig. 2 is a vertical transverse sectionfsubstantially on line 22 of Fig. 1, and i Fig. 3 is a top plan view of the left hand end of the machine as viewed in Fig." 1.

The machine as illustrated comprises a frame having base members 10 at the-sides thereof and upright members 11 mounted on the base members. In the form shown there are four of these uprights arranged in a rectangle, and the uprights are connected by 80 longitudinally extending side members 12 and 13 and they are also connected by cross beams 14. In this frame is mounted a pair of screens 15 and 16 in superposed relation.

The upper screen 15 is preferably of a larger mesh than the lower screen to first give a.

rough screening of the material and remove the larger particles and to lnsure a uniform material being fed to the lower screen. The screens themselves may be of any suitable; material, such as woven wire mesh. At their lateral side edges are upwardly extending side members 17 and at one end is a similar cross member 18. The screens are preferably somewhat inclined, as shown in Fig. 1, and there is no upright cross member atthe lower end so that the material which is too large to pass through the screen may be discharged at this chutes 19and20 to carry the material'to one d I 'i The s'creens'are mounted in a novel and effective manner to permit reciprocating movement thereof without sliding connecas tions, and therefore, .with'a minimum offrict1on. Theupper screen 1s earned by up-,

right links 21, there being'four of these links,

two on eachside thereof. '01 course,.the.;-

number maybe increased if found desirable. co I These links are pivoted at their upper ends .to the screen, as shown at 22, and at their lower ends to the lower sidemember 14 of theframe, as shown at 23; A The lower screen is mounted onfsimilar upright links 245 which .are pivoted at their upper ends to the upper side memberilfi of the frame, as indicated I at '25, and {at theirlower ends they 'are piv- 1 oted to the screen, as indicated at 26. It will-r,

be apparent that the screens may bejrecipro I0 I cated back and fourth on these links as supports. It is preferre'd that they move in opposite directions, that is, that one screen be moved to the right while the other screen;

is moving to the left. A simple and effective means for doing this is an upright lever 27 pivoted to the frame at 28 and pivotally con- 'nectedto the two screens at '29 above and I below this pivot, the pivot 28 being on'thef central side member 12 of the -frame. These 7 leveris extended below the lower screen and is connected by a link 30with a crank 31on a shaft: 32.,{It is preferred to provide this lever, and crank on both sides of the frameso as 'tofgive uniform operation of the screen from bothsides. The shaft is operated by any suitable'.device,- such as a motorl33 having suitable driving connection therewith, such asabeltB l, I 5 f Below the lowerscreen is a conveyor 35f-for v [conveying the screened material from under the screen where it is easilyac'cessib-le. This -may beof any suitabletype but is preferably a simple belt {conveyor passing over two:

drums 36, one of which is onlthe shaft and operated thereby, and this conveyor dis-' charges. screened material at the rear-end of the machine. To also prevent 'shaking or lower end. Extendlng transversely of the 50 frame below the discharge ends are inclined discharging of the material being screened ing of'the same, upwardly and [outwardly inclined guides 37 are provided about the upper edge of the screens. I also preferably provide downwardly and inwardly inclined guides 38 on the, under sides of these screens and stationary guides 39 may be carried by thef'rame over the conveyor 35. Although a feed'hopperis not ne'cessary'l prefer to provide one as it gives a more'uniform feed of the material. Such a hopper is shown at &0 I and has a 1 ;epe n :endidis harg a ent the upper screen.

It will be apparent from the foregoing description that the lever 27 will be rocked about its pivot by the-crank 31% through the .link, 0 :a th eh f r3 is ret te A th lever is connected'on opposite sides of-its p o to, the two s reens thesesereeh will be lre ipreeetei nfeppo ite di eetiQ eand-th sPei jifiemwh i ge the cre n 0. theupi' ig inksQl and 2 pe mi s his reeipre e mg m vem n w h a m nimum of: f t on- There-vie usua ly enellg Pl y o loes ness i the .cenne ion t e a m re o ee et iie iker .qu hang of, d' eet en' 1 1 a "par e to he' ee Q g a haking eff t i cr ase he flewof mate al thr ugh th s e n The Op ra-h is t iu i s rh causejth'e material too large to passjth-rough th s reens is d he gedet' the. wero dieat their under lateral sides, longitudinally extending upwardly and outwardly inclined deflector plates at the upper lateral sides of eharge end o h creen into t ide e i v1 .ahelf n th en me erieli adi eh rged a th rightiha d o a en of t -e0 v y It h eb e feund i Practi tha t i screen ng d i i ery efiee iv i H ving; t s i ort th ,hat r ef iny "invent e Wha la ni i requirescon paratively little power to oper-- a e @Ildhfl nlarg -capa ty A c eening device o sen and rh le materiel miejr sihg a rame-a ar of i ehg t l nally c ne e e neerr ng ene ab v 7 the other andzeachcomprisi'ng a foraininous m m e c an prigh id memb rs ithfoh e embe ...a i eff ramineus membe th e he end Prov ding er' e exi fe met r 'l" to a ge gp s t roug the'sere'en lat r lly ex end ng I f ute und i c eeex ther f sm 'peir o rigid up ghtlinks pivetedia th r uppe en to the pper scree use nd adja n e ch fen ief, th lever sereenl an p voted, -th i upp e ds to the' ram "an pright le erpive d ii te-rmeilia eli I ends t the" framean'd having piY taleQnnec-i sides of said pivot wherebyoscilllation Of .Said

-. lever .)s mult eeu iy. shi t. he. scree i longitudinel yiinoppo it -d ections Q 1; the up or ihg. L nks, rdewn a yand, inwardlyin line .defi eter pla es secure ft ea leere n' ea endihg ehgit ii na' lyi there Y ends f r car y ng way themate al r ceive a i eac end the eof an 1 pivot-ed .e their lower en t th l'fi I. ,-h pa e1": eim "'lar rigid-upright'links pivoted attheir lower ac ion ithithe respeet e c een 1 opp i 

